Ultrasoft Effects in Heavy-Quarkonium Physics

Details Ultrasoft Effects in Heavy-Quarkonium Physics Ultrasoft Effects in Heavy-Quarkonium Physics

1999-07-26

arxiv.org/abs/hep-ph/9907489v2

Nucl.Phys. B563 (1999) 200-210

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages (Latex), 5 figures (Axodraw), one reference added, accepted for publication in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(99)00564-7

In the framework of nonrelativistic QCD, we consider a new class of radiative corrections, which are generated at next-to-next-to-next-to-leading order through the chromoelectric dipole interaction of heavy quarkonium with ultrasoft virtual gluons. We provide analytical formulae from which the resulting shifts in the quarkonium energy levels and the wave functions at the origin may be calculated. We discuss the phenomenological implications for the top-antitop and Upsilon systems and point out some limitations of describing charmonium using a Coulomb potential.

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